feat: add CodeRabbit AI code review

Hey 👋 @adithya-s-k I work as a dev tools consultant and came across Paras's tweet yesterday about Omniparse (https://x.com/paraschopra/status/1855495029231698328). I really liked what you're building and thought CodeRabbit could be super helpful for your project. ## Why CodeRabbit? - Free for open source projects - Helps maintain code quality with automated reviews - Particularly good for data processing code quality and documentation ## What's in this PR? - Added `.coderabbit.yaml` configured specifically for your Python data processing needs - Focus on: - Type safety - Memory efficiency - Data processing edge cases - Documentation quality ## Quick Setup: 1. Sign up at [coderabbit.ai ](https://app.coderabbit.ai/) with GitHub 2. Add your public GitHub repo 3. That's it! CodeRabbit will start reviewing PRs automatically  I've also reached out to @aravindputrevu, who works at CodeRabbit, and he's agreed to provide some credits for your project. Please get in touch with him if you haven't received them yet. Let me know if you'd like any adjustments to the configuration or need help with setup. Happy to help make the integration smooth 🚀 Some samples PR how coderabbit can help: https://github.com/sartography/spiff-arena/pull/1233#discussion_r1529013218 https://github.com/kmesiab/equilibria/pull/1#discussion_r1505474270 https://github.com/kamiazya/web-csv-toolbox/pull/60#discussion_r1453463448 https://github.com/openreplay/openreplay/pull/1858#discussion_r1467629285 https://github.com/ls1intum/Artemis/pull/8037#discussion_r1494109998 https://github.com/tyaga001/devtoolsacademy/pull/19